Vulnerability · Published Aug 5, 2026 · Assigned by Wordfence

CVE-2026-17532Seraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting

Medium 6.1

In plain English

A medium-severity cross-site scripting in Seraphinite Accelerator from seraphinitesoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.8%top 43.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling2Nuclei, Public PoC

Official description

The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.

Affected products (as reported)

Vendor	Product	Versions
seraphinitesoft	Seraphinite Accelerator	0 – through 2.29.18

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

In plain English

Official description

Affected products (as reported)

References